Answers:
Someone infected would have to be coughing or sneezing intensely close to you, but it IS possible.
http://www.mayoclinic.com/health/mononuc...

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No

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nope. its in saliva. not airborn

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You would hold to be in close contact beside that person. Mono is carried surrounded by liquid droplets contained by the air, approaching if someone was to sneeze or cough. Since solution droplets are heavy they dont stay nouns born long, so you would need to fringe someone when they sneezed or coughed.

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